双波长差示分光光度法测定钨精矿中钨

Determination of Tungsten in Refined Tungsten Minerals by Dual-Wavelength Differential Spectrophotometry

研究制定了一种精密、方便的测定钨精矿中钨的硫氰酸盐双波长差示分光光度法,分析了标样及实际样品,结果与重量法一致。相对误差及测定精密度均≤0.5％。

A dual-wavelength differential spectrophotometric method used to determine W in refined tungsten minerals is studied. The factors effecting stability of the result in conventional differential spectrophotometric method for W are investigated and eliminated. Some methods for dissolving sample are compared, sulfur-phosphorus mixed acid is selected, with the adventages of rapidity, completion for dissolution and also of less amounts of reagents used. The results are accorded with those by gravimetric method and the precision and accuracy are better than 0. 5%.